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    <h2>HTTP 404 Status</h2> <p>To return a 404 header, just use the <code>:status</code> option for the render method.</p> <pre><code>def action # here the code render :status =&gt; 404 end </code></pre> <p>If you want to render the standard 404 page you can extract the feature in a method.</p> <pre><code>def render_404 respond_to do |format| format.html { render :file =&gt; "#{Rails.root}/public/404", :layout =&gt; false, :status =&gt; :not_found } format.xml { head :not_found } format.any { head :not_found } end end </code></pre> <p>and call it in your action</p> <pre><code>def action # here the code render_404 end </code></pre> <p>If you want the action to render the error page and stop, simply use a return statement.</p> <pre><code>def action render_404 and return if params[:something].blank? # here the code that will never be executed end </code></pre> <h2>ActiveRecord and HTTP 404</h2> <p>Also remember that Rails rescues some ActiveRecord errors, such as the <code>ActiveRecord::RecordNotFound</code> displaying the 404 error page.</p> <p>It means you don't need to rescue this action yourself</p> <pre><code>def show user = User.find(params[:id]) end </code></pre> <p><code>User.find</code> raises an <code>ActiveRecord::RecordNotFound</code> when the user doesn't exist. This is a very powerful feature. Look at the following code</p> <pre><code>def show user = User.find_by_email(params[:email]) or raise("not found") # ... end </code></pre> <p>You can simplify it by delegating to Rails the check. Simply use the bang version.</p> <pre><code>def show user = User.find_by_email!(params[:email]) # ... end </code></pre>
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    1. POHow to redirect to a 404 in Rails?
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    1. USBob Aman
    1. USSimone Carletti
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    1. COThere's a big problem with this solution; it will still run the code in the template. So if you have a simple, restful structure and someone enters an ID that doesn't exist, your template will be looking for the object which doesn't exist.
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      1. USjcalvert
    2. COAs mentioned before, this is not the correct answer. Try Steven's.
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      1. USPablo Marambio
    3. COChanged the selected answer to reflect the better practice. Thanks for the comments, guys!
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      1. USYuval Karmi
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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